CN103582705A - Exhaust gas recovery device for converter furnace and method for recovering exhaust gas for converter furnace - Google Patents
Exhaust gas recovery device for converter furnace and method for recovering exhaust gas for converter furnace Download PDFInfo
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- CN103582705A CN103582705A CN201280007019.8A CN201280007019A CN103582705A CN 103582705 A CN103582705 A CN 103582705A CN 201280007019 A CN201280007019 A CN 201280007019A CN 103582705 A CN103582705 A CN 103582705A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
An exhaust gas recovery device for a converter furnace is provided with: a furnace top oxygen analyzer for analyzing the oxygen concentration in exhaust gas in an exhaust pathway and further upstream than a dust collection position for collecting dust, and a furnace top CO analyzer for analyzing the CO concentration in the same exhaust gas; and a furnace bottom oxygen analyzer for irradiating a laser beam into the exhaust gas that flows further downstream than the dust collection position, and analyzing oxygen concentration on the basis of variation in the luminous flux causing by photoabsorption of the laser light.
Description
Technical field
The present invention relates to the waste gas control of dust producing in converter, in on-fuel mode, reclaim converter waste gas retrieving arrangement and the converter waste gas recovery method of inflammable gas.
Background technology
The waste gas producing when converter refining is the gas of the carbon monoxide that contains high density.As the device of processing this converter waste gas, the non-combustion-type exhaust gas treatment apparatus that has after converter furnace roof makes the CO burning in waste gas by the combustion-type exhaust gas treatment apparatus of boiler recovered energy and do not make CO burning and reclaim.As non-combustion-type exhaust gas treatment apparatus, for example, use typically such described in non-patent literature 1, OG mode converter waste gas retrieving arrangement.
In refining in converter, first in converter, pack iron liquid into, by bessemerizing, mainly carry out Decarburising and refining.After refining completes, molten steel is tapped, and by slag deslagging, for next refining, pack iron liquid into.In above such converter refining circulation, the waste gas that produces the carbon monoxide that contains in a large number high density is in bessemerizing.When non-blowing, do not produce waste gas.In addition, just start blowing after, waste gas generation sharply increases, but just start blowing after waste gas in contain high density oxygen, carbon monoxide concentration is not high.From blowing, start the elapsed time, and the reduction of the oxygen concn in waste gas, carbon monoxide concentration increases.
Just started after blowing, when the not high moment of the carbon monoxide concentration from waste gas starts to reclaim waste gas, the composition as fuel gas of the waste gas reclaiming reduces, therefore also not preferred.Therefore, conventionally, as described in patent documentation 1, when bessemerizing beginning, by waste gas spreading in atmosphere.And, CO concentration analyzer (furnace roof CO analyser) in gas being set in the exhaust path of the Department of Radiation of converter furnace roof, measure the carbon monoxide concentration in waste gas, if more than the carbon monoxide concentration in waste gas rises to finite concentration, start waste gas to the recovery of gas-holder.
As described above, after just starting blowing, the oxygen concn in waste gas is high.In addition,, while sneaking into outer gas when produce damaged grade in exhaust path, the oxygen concn in waste gas can increase sometimes.If reclaim waste gas when the oxygen concn in waste gas is high, the composition of waste gas likely surpasses explosion limits.Therefore, viewpoint from security, oxygen concn analyser (furnace roof oxygen analyzer) in gas being set in the exhaust path of the Department of Radiation of converter furnace roof, and oxygen concn analyser (oxygen analyzer under stove) in gas being set in the flue after wet type control of dust, only, in the situation that the oxygen concn in the waste gas at this two place is below finite concentration, waste gas is recovered in gas-holder.
When blowing starts, after closing recovery valve, by the operation of T-valve, the waste gas from flue is discharged in diffusing tower.After blowing starts, for example, for example, more than the carbon monoxide concentration by furnace roof CO analyser instrumentation becomes finite concentration, when the oxygen concn more than 25% and in two place's waste gas of oxygen analyzer instrumentation under furnace roof oxygen analyzer and stove becomes below finite concentration, the condition below 2% has been set up, just open recovery valve, thereby and switch exhaust path beginning waste gas to the recovery of gas-holder by the operation of T-valve.
During oxygen concn in converter waste gas is analyzed, general method is that the gas in sampling flue (exhaust path) is also analyzed.For example used the magnetic oxygen analyser of wet type sampler.Use current from stack sampling gas, via sluicing separator, gas cooler, and further via sluicing separator, gas sampled is imported to magnetic oxygen analyser, measure the oxygen concn in gas sampled.
In converter gas concentration unit in the past, exist the analyzing responding in oxygen analyzer under stove to postpone, therefore after bessemerizing beginning, can postpone the period that waste gas is started to be recovered in gas-holder, has and can not effectively utilize fully the problem as the converter waste gas of inflammable gas.
In addition,, as gas analyzer, for example patent documentation 2,3 discloses in mensurated gas composition irradiating laser, according to the light quantity being caused by photoabsorption of this laser, has changed the laser gas analyzer that carrys out mensurated gas composition concentration.
But, also laser gas analyzer as described above is not applied to the example in converter gas concentration unit so far.
Prior art document
Patent documentation
Patent documentation 1: Japanese kokai publication hei 5-209212 communique
Patent documentation 2: TOHKEMY 2002-277391 communique
Patent documentation 3: TOHKEMY 2007-170841 communique
Non-patent literature
Non-patent literature 1: the 462nd page of " the 3rd edition iron and steel brief guide II iron-making and steel-making " (Japanese Iron Steel Association meeting Knitting " the 3rd edition iron Steel Bian list II System Milling System Steel ") compiles in Japanese iron and steel institute
Summary of the invention
Invent problem to be solved
The present invention makes according to above-mentioned opinion.; the object of the present invention is to provide a kind of converter waste gas retrieving arrangement and converter waste gas recovery method; by the waste gas producing in converter (converter waste gas) control of dust, in on-fuel mode, reclaim in the converter waste gas retrieving arrangement of inflammable gas; as oxygen analyzer under stove, use laser gas analyzer; can reduce the analyzing responding that in the gas in the exhaust path after control of dust, oxygen is analyzed and postpone, and increase the yield of converter waste gas.
For solving the scheme of problem
In order to solve above-mentioned problem and to realize relevant object, the present invention has adopted following scheme.
(1) the converter waste gas retrieving arrangement that a scheme of the present invention relates to, when the waste gas producing is mobile in exhaust path, it is carried out to control of dust in making converter, in on-fuel mode, reclaim inflammable gas, this converter waste gas retrieving arrangement possesses: furnace roof oxygen analyzer and furnace roof CO analyser, this furnace roof oxygen analyzer analysis is in described exhaust path and more leaning on the oxygen concn in the described waste gas of upstream end than the control of dust position of carrying out described control of dust, the analysis of this furnace roof CO analyser is in described exhaust path and more leaning on the CO concentration in the described waste gas of upstream end than the control of dust position of carrying out described control of dust, and oxygen analyzer under stove, to irradiating laser in more leaning on the described waste gas of downstream flow than described control of dust position, according to the light quantity being caused by photoabsorption of this laser, change, analyze oxygen concn.
(2), in the converter waste gas retrieving arrangement of recording in above-mentioned (1), can be also that under described stove, oxygen analyzer possesses: laser irradiating part, irradiates described laser in the rectangular mode of medullary ray of the stream with respect to described waste gas; Laser light-receiving part, is subject to light to pass through the described laser after described waste gas; The first tubular stinger, outstanding to surround the mode of surrounding of light path of described laser in described exhaust path from described laser irradiating part, and front opening; The second tubular stinger, outstanding to surround the mode of surrounding of light path of described laser in described exhaust path from described laser light-receiving part, and front opening; And nitrogen gas supply unit, in described the first tubular stinger and in described the second tubular stinger, supply with nitrogen respectively.
(3) in the converter waste gas retrieving arrangement of recording in above-mentioned (2), also can be that the described laser light-receiving part of take is subject to the transmissivity of the described laser that the light quantity of the described laser of the wavelength beyond the oxygen absorption wavelength of light represents with respect to the ratio of the light quantity of the described laser irradiating from described laser irradiating part as more than 10%.
(4) in the converter waste gas retrieving arrangement of recording in above-mentioned (3), can be also, the interval of front end of the front end of described the first tubular stinger and described the second tubular stinger and the relation of described transmissivity meet following formula 1,
X=α * exp(-L * β * v) * 100 formula 1
Herein, X is described transmissivity, and unit is %, and L is described interval, and unit is m, the flow velocity that v is described waste gas, and unit is m/s, the reduction coefficient that α is described laser, β is for representing the coefficient of the absorbancy of described waste gas.
(5) in the converter waste gas retrieving arrangement that any one is recorded in above-mentioned (2)～(4), also can be, in the situation that observe with the vertical sight line of the virtual plane of the medullary ray of the stream with respect to comprising described waste gas and the optical axis of described laser, in the flow direction downstream side of the front end of described the first tubular stinger and these both sides' of front end of described the second tubular stinger described waste gas, be formed with respectively otch.
(6) in the converter waste gas retrieving arrangement of recording in above-mentioned (5), also can be, in the situation that observing described otch with described sight line, the medullary ray scarp of 75 ° of following inclinations above at 45 ° by the stream with respect to described waste gas forms, and, more than 1/3 below 2/3 of the physical dimension that the length dimension of the direction of the medullary ray of the stream along described waste gas on this scarp is described tubular stinger.
(7) the converter waste gas recovery method that a scheme of the present invention relates to, is used the converter waste gas retrieving arrangement that in above-mentioned (1)～(6), any one is recorded to carry out, and wherein, when starting to bessemerize, the described waste gas producing is carried out to atmosphere and diffuses; At the described oxygen concn being analyzed by described furnace roof oxygen analyzer with the described oxygen concn that under by described stove, oxygen analyzer analyzes is below normality and the described CO concentration being analyzed by described furnace roof CO analyser is normality when above, reclaim described waste gas.
Invention effect
The converter waste gas retrieving arrangement that the such scheme of the application of the invention relates to or converter waste gas recovery method, in the waste gas control of dust producing in converter, the converter waste gas that reclaims inflammable gas in on-fuel mode are reclaimed, the operating lag that the oxygen in gas is analyzed can be reduced, and the yield of converter waste gas can be increased.In addition,, in the situation that used the laser gas analyzer with tubular stinger, can further improve and measure precision, operability.
Accompanying drawing explanation
Fig. 1 means the front view of the whole summary of OG mode converter waste gas retrieving arrangement.
Fig. 2 A means the figure that has used the situation of laser gas analyzer as oxygen analyzer under stove.
Fig. 2 B means the figure of the situation while having used the laser gas analyzer with tubular stinger as oxygen analyzer under stove.
Fig. 3 A means the routine figure of the front end shape of tubular stinger, is tubular stinger have been carried out to the figure of side-looking.
Fig. 3 B means the routine figure of the front end shape of tubular stinger, is the figure observing from the opening surface side of tubular stinger.
Fig. 3 C means the schematic diagram of the relation of the otch of tubular stinger and the flow direction of waste gas.
Fig. 4 means the figure of the time lapse of the analytical results of bessemerizing the gas analyzer after beginning.
Embodiment
In converter waste gas retrieving arrangement in the past, converter waste gas moves along exhaust path, from the position by furnace roof oxygen analyzer till by the required time of the position of oxygen analyzer stove be about 30 seconds.; when the time lapse of the gas concentration that comparison is analyzed by gas analyzer from just starting to bessemerize; known from the gas of being analyzed by furnace roof oxygen analyzer oxygen concn become below 2%, till in the gas of oxygen analyzer analysis under stove oxygen concn become below 2%, passed through approximately 110 seconds.The reason that analyzing responding under this stove in oxygen analyzer postpones is estimated to be, during the oxygen under stove in oxygen analyzer is analyzed, from by exhaust path gas sampled till draw the delay of the analytical results of this gas.
Laser gas analyzer is to mensurated gas composition irradiating laser mobile in pipeline, thereby detected transmission, measures the laser detected gas composition in space.The application of the water vapour of therefore, not considering to produce when containing the such dust of converter dust, control of dust, the converter gas that makes laser light scattering.
People of the present invention have understood fully, by using laser gas analyzer as oxygen analyzer under the stove of converter waste gas retrieving arrangement as described later, and can reduce the operating lag that the oxygen in gas is analyzed.
Below, the converter waste gas retrieving arrangement and the converter waste gas recovery method that present embodiment are related to describe.Fig. 1 illustrates the integral body of the OG mode converter waste gas retrieving arrangement adopting in present embodiment.
The waste gas producing in converter, is collected by the fume hood 2 that is configured in the top of converter 1.Collected waste gas is cooling by Department of Radiation 3, follows venturi scrubber (control of dust position) the 4 wet type controls of dust by secondary.Waste gas after wet type control of dust, by 5 air-supplies of induced draught machine midway that are arranged on flue 11, and arrives T-valve 6.Path by a side of T-valve 6 branches arrives diffusing tower 8, along the waste gas of this path flow, in atmosphere, diffuses.By the opposing party's of T-valve 6 branches path, via recovery valve 9, arrive gas-holder 10.By operation T-valve 6, can select the waste gas guiding gas-holder 10 of discharging from converter 1 or diffuse from diffusing tower 8.As described above, converter gas flows towards the diffusing tower as downstream side or gas-holder from the converter as upstream side.Below the path of the gas flow from converter to diffusing tower or till gas-holder is generically and collectively referred to as to exhaust path.
Converter furnace roof, than the exhaust path of the more top trip in wet type control of dust position, be in Department of Radiation 3, dispose CO concentration analyzer in (hereinafter referred to as the furnace roof oxygen analyzer) 21 of oxygen concn analyser in the first gas and gas (hereinafter referred to as furnace roof CO analyser) 22.In addition, in the exhaust path of swimming more on the lower than wet type control of dust position, be in flue 11, dispose oxygen concn analyser in the second gas (hereinafter referred to as oxygen analyzer under stove) 23.In addition, under stove, oxygen analyzer 23 is configured in the flue 11 in downstream side of induced draught machine 5.
For converter waste gas being recovered in gas-holder 10, still diffusing the judgement in atmosphere via diffusing tower 8, according to the gasometry result of waste gas, carry out.For example, using the carbon monoxide concentration in the waste gas being analyzed by furnace roof CO analyser 22, be that oxygen concn both sides are below 2% as recovering condition more than 25% and in the waste gas that under furnace roof oxygen analyzer 21 and stove, oxygen analyzer 23 analyzes, in the situation that recovering condition is set up, waste gas is recovered in gas-holder 10.Even in the situation that having a condition not to be inconsistent, recovering condition becomes non-establishment, and waste gas is diffused from diffusing tower 8.In addition, above-mentioned recovering condition is an example, can be by the suitable change of each equipment.
As described above, when bessemerizing beginning, the oxygen concn in converter waste gas is high, and carbon monoxide concentration is low, therefore converter waste gas is diffused from diffusing tower 8.Along with the process of blowing, the oxygen concn in the gas of being analyzed by oxygen analyzer under furnace roof oxygen analyzer 21, stove 23 reduces, and the carbon monoxide concentration in the gas of being analyzed by furnace roof CO analyser 22 rises.After this, when analyzed gaseous constituent reaches recovering condition establishment, T-valve 6 operations are arrived and reclaimed side, and open recovery valve 9, start the gas recovery to gas-holder 10.
In the present embodiment, as oxygen analyzer under stove 23, use to irradiating laser in the waste gas of flue 11, according to the light quantity being caused by photoabsorption of this laser, change the laser gas analyzer 25 that carrys out mensurated gas composition concentration.Laser gas analyzer 25, as shown in Figure 2 A, by the space illumination towards wanting to measure measure laser irradiating part 26 with laser 30, detect transmission the mensuration in mensuration space with the laser light-receiving part 27 of laser 30 and the arithmetic processing apparatus 31 of processing the output signal of this laser light-receiving part, form.In the wavelength continually varying while of the laser 30 that makes to send from laser irradiating part 26, to measuring space illumination, by the output signal of the laser light-receiving part 27 by arithmetic processing apparatus 31 is analyzed and computing obtains as this result, and obtain molecule, the mean concns of atom and the data of medial temperature as detected object.
In the converter waste gas retrieving arrangement relating in present embodiment, in the flue 11 of the exhaust path as swimming more on the lower than wet type control of dust position, as oxygen analyzer under stove 23, laser gas analyzer 25 is set.In the present embodiment, as shown in Figure 1, in the exhaust path in the downstream side of induced draught machine 5, laser gas analyzer 25 is set.Waste gas in flue 11 is to have carried out wet type control of dust waste gas afterwards, so the amount of the dust in waste gas significantly reduces.As shown in Figure 2 A, at the outside of flue 11 configuration laser irradiating part 26, so that the rectangular mode of medullary ray of the stream of the waste gas in the relative flue 11 of laser 30 is irradiated towards waste gas.At outside configuration laser light-receiving part 27 flue 11 and laser irradiating part 26 opposition sides.By the laser gas analyzer 25 of such configuration, can analyze the oxygen concn of waste gas mobile in flue 11.
The flue 11 in the downstream side of the induced draught machine 5 of converter waste gas retrieving arrangement is the heavy caliber of diameter over 2m.The length of the light path of the laser 30 from laser irradiating part 26 to laser light-receiving part 27 becomes equal or for more than it with the diameter of flue 11.In the converter waste gas retrieving arrangement relating in present embodiment, by venturi scrubber (control of dust position) 4, carry out wet type control of dust, therefore in waste gas, contained much moisture.In addition, in flue 11, conventionally, the temperature of waste gas is reduced to below 100 ℃, therefore easily causes dewfall etc.The in the situation that of there is many dusts, water droplet in waste gas, when the light path of laser 30 is long, laser 30 is measured by dust, water droplet scattering the difficulty that becomes sometimes.In this case, as shown in Figure 2 B, preferred disposition is from laser irradiating part 26 sides and laser light-receiving part 27 sides, to surround the tubular stinger 28 of the outstanding and front opening of the mode of surrounding of light path of laser 30.In addition, in tubular stinger 28, preferably in the mobile mode of tubular stinger front end towards stove inner side, from nitrogen gas supply unit 32 as Purge gas 29 and flowing nitrogen.Thus, in tubular stinger, be always full of clean nitrogen.That is, the mobile light path of mensurated gas composition in the light path of laser 30, the front end that becomes the tubular stinger 28 from being extended by both sides to front end, be the interval between the front end of tubular stinger.Thereby, by the setting of tubular stinger 28, can shorten by the optical path length of the laser 30 in mensurated gas composition.As a result, even if contain dust, water droplet in waste gas, also can reduce the scattering of laser 30, can precision oxygen concn in analytical gas well.
Further, even if contain dust, water droplet in waste gas, for oxygen concn in analytical gas more reliably, the transmissivity that also preferably makes laser 30 is more than 10%.Herein, so-called transmissivity refers to, is subject to the light quantity of laser of the wavelength beyond the oxygen absorption wavelength of light with respect to the ratio of the light quantity of the laser irradiating from laser irradiating part by laser light-receiving part.
In addition, people of the present invention have understood fully, in the converter waste gas retrieving arrangement relating to, the transmissivity of laser, by the optical path length of the laser in waste gas and the flow velocity of waste gas, have such relevant of following formula 1 for present embodiment.That is, according to the flow velocity of waste gas, adjust by the optical path length of the laser in waste gas, the i.e. interval from the front end of the tubular stinger 28 that extends from both sides to front end, can easily obtain thus the transmissivity of regulation.
X=α * exp(-L * β * v) * 100 formula 1
Herein, X is transmissivity (%), and L is optical path length (m), the flow velocity that v is waste gas (m/s), and α is the reduction coefficient of the laser irrelevant with waste gas flow velocity, β is for representing the coefficient with respect to the absorbancy of the waste gas of flow velocity.
In addition, in the converter waste gas retrieving arrangement relating in present embodiment, make α=0.43, β=0.0278.
In laser gas analyzer such, that there is tubular stinger 28 as shown in Figure 2 B, in the situation that converter waste gas contains dust, water droplet etc., sometimes converter waste gas from the front end of tubular stinger 28 towards the inside of tubular stinger 28 and invade.As a result, adhesive dust, water droplet on the inwall of tubular stinger 28, laser irradiating part, laser light-receiving part etc., likely analysis precision can reduce.Therefore, worry that the frequency of safeguarding increases, productivity reduces.
People of the present invention have understood fully, by making the change in shape of opening surface of the front end of tubular stinger 28, and can suppress converter waste gas to the intrusion in tubular stinger 28.Particularly, tubular stinger is in the situation that with the vertical sight line observation of the virtual plane of the medullary ray of the stream with respect to comprising described waste gas and the optical axis of described laser, as shown in Figure 3 C, known preferably have otch in the flow direction downstream side of described waste gas.Its reason is considered to, and by having otch in downstream side, the converter waste gas colliding with the inwall of tubular stinger can reduce.
Further known, about this otch, in the situation that observe with above-mentioned sight line, more preferably the medullary ray scarp of 75 ° of following inclinations above at 45 ° by the stream with respect to waste gas forms, and, more than 1/3 below 2/3 of the physical dimension that the length dimension of the direction of the medullary ray of the stream along waste gas on this scarp is described tubular stinger.Above-mentioned inclination is during lower than 45 °, and the converter waste gas colliding with inwall does not reduce, and while surpassing 75 °, otch area is large, the influx of converter waste gas increases, therefore not preferred.In addition, at above-mentioned length dimension, surpass at 2/3 o'clock, otch area is large, the influx of converter waste gas increases, therefore not preferred.On the other hand, lower than 1/3 o'clock, do not reduce with the converter waste gas of inwall collision.
In the present embodiment, for furnace roof oxygen analyzer 21 and furnace roof CO analyser 22, used analyser same.As its reason, be, in the past, the operating lag of gasometry is oxygen analyzer 23 under stove significantly, by oxygen analyzer under stove 23 is changed to laser gas analyzer 25 from magnetic oxygen analyser, and the recovery beginning of converter waste gas (waste gas) can be shifted to an earlier date period, can access the effect that gas recovery amount increases.In addition, for furnace roof oxygen analyzer 21 and furnace roof CO analyser 22, even if use laser gas analyzer, also can't harm the effect in present embodiment.
In the converter waste gas recovery method relating in present embodiment, the converter waste gas retrieving arrangement that uses above-mentioned present embodiment to relate to, when starting to bessemerize, the converter waste gas of generation is diffused to atmosphere, in the gas of measuring at the laser gas analyzer 25 being used by oxygen analyzer 23 under as furnace roof oxygen analyzer 21 and stove, oxygen concn becomes below normality and in the gas of being measured by furnace roof CO analyser 22 CO concentration and becomes normality when above, gas is diffused to the recovery being switched to gas-holder 10 from atmosphere.As oxygen analyzer under stove 23, use laser gas analyzer 25, therefore the recovery beginning of converter waste gas can have been shifted to an earlier date period, can realize the increase of gas recovery amount.
Above, the OG mode converter waste gas retrieving arrangement of take is illustrated as example, but above-mentioned mode, in the situation that in non-combustion-type gas concentration unit using the oxygen concn in downstream as recovering condition, even also can implement for alternate manner.
Embodiment
(embodiment 1)
In the OG of 300 tons of converters mode converter waste gas retrieving arrangement, applied the present invention.The integral body of OG mode converter waste gas retrieving arrangement as shown in Figure 1.
In the exhaust path of the Department of Radiation 3 of converter furnace roof, furnace roof oxygen analyzer 21 and furnace roof CO analyser 22 are set, in the flue 11 of swimming more on the lower than wet type control of dust position, are provided with oxygen analyzer 23 under stove.When blowing starts, after having closed recovery valve 9, by the operation of T-valve 6, the waste gas from flue 11 is discharged to diffusing tower 8.After blowing starts, when the carbon monoxide concentration by furnace roof CO analyser 22 instrumentations becomes oxygen concn more than 25% and in two place's waste gas of oxygen analyzer 23 instrumentations under furnace roof oxygen analyzer 21 and stove and all becomes condition below 2% and set up, just open recovery valve 9, thereby and by the operation of T-valve 6, switch exhaust path and started the recovery of waste gas to gas-holder 10.
Conventional example is, under furnace roof oxygen analyzer 21, stove, in oxygen analyzer 23, used magnetic analyzer, in furnace roof CO analyser 22, used infrared-type analyser.
In the inventive example, with respect to conventional example, as oxygen analyzer under stove 23, used laser gas analyzer 25 this point different.In the flue 11 in the downstream side of induced draught machine 5, be provided with laser gas analyzer 25 as shown in Figure 2 B.In the outside of flue 11, dispose laser irradiating part 26, the waste gas by laser 30 in flue 11 irradiates, and disposes laser light-receiving part 27 in the outside of laser irradiating part 26 opposition sides with flue 11.The wavelength continually varying of the laser 30 that makes to send from laser irradiating part 26 simultaneously, will measure use laser 30 to mensuration space illumination, by the output signal of the laser light-receiving part 27 by arithmetic processing apparatus 31 is analyzed, computing obtains as this result, and analyzed by the oxygen concn in the waste gas of flue interior 11.The diameter of flue 11 arrives greatly 2.4m, is therefore provided with as shown in Figure 2 B tubular stinger 28.In tubular stinger 28, in the mobile mode of tubular stinger front end towards stove inner side, as Purge gas 29 and the nitrogen that flowed.In addition, make the front end of the tubular stinger 28 from extending from both sides to the 1m that is spaced apart of front end.Thus, the length of the light path by the laser 30 in waste gas becomes 1m, even if waste gas contains dust, moisture, also can analyze without any problems the oxygen concn in waste gas.In addition, the front end of tubular stinger 28 is the such shape of figure b shown in Fig. 3 A, Fig. 3 B in conventional example, the inventive example.
Fig. 4 shows, the time from starting the blowing converter 1 through, with gasometry result A based on furnace roof oxygen analyzer 21, gasometry result B based on furnace roof CO analyser 22, stove based on conventional example under the time lapse of the gasometry result C2 of oxygen analyzer 23 under the gasometry result C1 of oxygen analyzer 23 and the stove based on the inventive example.In the drawings, 41 represent the timing that furnace roof CO analyser condition is set up, the timing that under 42 stoves that represent in existing method, oxygen analyzer condition is set up, the timing that under 43 stoves that represent in the inventive method, oxygen analyzer condition is set up.
The transverse axis of Fig. 4 is at approximately 20 seconds, to locate to have started blowing.
In the prior embodiment, first the condition of furnace roof oxygen analyzer (waste gas oxygen concn is below 2%) is set up, further at approximately 90 seconds, locate the condition (waste gas CO concentration is more than 25%) of furnace roof CO analyser and set up (41 timing in figure), then under approximately 170 seconds place's stoves, the condition (waste gas oxygen concn is below 2%) of oxygen analyzer is set up (42 timing in figure).At this, be " recovering condition establishment " constantly, start the program to gas recovery.
In the inventive example, first set up almost simultaneously with the condition of furnace roof oxygen analyzer, under approximately 60 seconds place's stoves, the condition of oxygen analyzer (waste gas oxygen concn is below 2%) is set up (43 timing in figure), then at approximately 90 seconds, locates the condition of furnace roof CO analyser and sets up (41 timing in figure).At this, be " recovering condition establishment " constantly, start the program to gas recovery.Thereby, compare with conventional example, in the inventive example, recovering condition is set up and was become 90 seconds from 170 seconds, has realized the time shorten that deducts 80 seconds.
(embodiment 2)
In the converter waste gas retrieving arrangement of embodiment 1, to having changed the situation of the front end shape of tubular stinger the figure a～d shown in Fig. 3 A, Fig. 3 B, evaluate.Metewand as described below.In addition, as shown in Figure 3 C, all with otch, the mode in the downstream side of the stream in gas is provided with tubular stinger.
In addition, in the situation that observe with the vertical sight line of the virtual plane of the medullary ray of the stream with respect to comprising described waste gas and the optical axis of described laser, the otch of figure a and d is trilateral, and cut sides is 67.5 ° with respect to the medullary ray angulation of the stream of waste gas.In addition 1/2 of the physical dimension that, the length dimension of the direction of the medullary ray of the stream along waste gas of the otch of figure a is tubular stinger.In addition, the length dimension of direction of the medullary ray of the stream along waste gas figure d, otch and the physical dimension of tubular stinger equate.On the other hand, the otch of figure c, in the situation that overlooking as described above, for rectangle, 1/4 of the physical dimension that the length dimension of the direction of the medullary ray of the stream along waste gas of this otch is tubular stinger, in the direction vertical with above-mentioned length dimension, be of a size of tubular stinger physical dimension 2/3.In addition, figure b does not have otch.
Evaluation is carried out to the adhesion amount of tubular stinger inwall by Visual Confirmation dust, water droplet.
(metewand)
Excellent: dust, water droplet adhere to pettiness
Good: adhering to of dust, water droplet is few
Can: adhering to of dust, water droplet is a large amount of
Table 1 represents result.Known by becoming the shape of figure a, can reduce dust to the adhesion amount of tubular stinger inwall.
[table 1]
| Figure | Evaluate |
| a | Excellent |
| b | Can |
| c | Good |
| d | Good |
Utilizability in industry
The converter waste gas retrieving arrangement of the application of the invention or converter waste gas recovery method, in the waste gas control of dust producing in converter, the converter waste gas that reclaims inflammable gas in on-fuel mode are reclaimed, the operating lag that the oxygen in gas is analyzed can be reduced, the yield of converter waste gas can be increased.
Nomenclature
1 converter
2 fume hoods
3 Departments of Radiation
4 venturi scrubbers
5 induced draught machines
6 T-valve
7 by-pass valve
8 diffusing towers
9 recovery valves
10 gas-holder
11 flues
21 furnace roof oxygen analyzers
22 furnace roof CO analysers
Oxygen analyzer under 23 stoves
25 laser gas analyzers
26 laser irradiating parts
27 laser light-receiving parts
28 tubular stingers
29 Purge gas
30 laser
31 arithmetic processing apparatus
32 nitrogen gas supply unit
The timing that the condition of 41 furnace roof CO analysers is set up
The timing that under stove in 42 existing methods, the condition of oxygen analyzer is set up
The timing that under stove in 43 the inventive method, the condition of oxygen analyzer is set up
Claims (7)
1. a converter waste gas retrieving arrangement, carries out control of dust to it when the waste gas producing in making converter is mobile in exhaust path, in on-fuel mode, reclaims inflammable gas, and this converter waste gas retrieving arrangement is characterised in that to possess:
Furnace roof oxygen analyzer and furnace roof CO analyser, this furnace roof oxygen analyzer analysis is more by the oxygen concn in the described waste gas of upstream end in described exhaust path and in the control of dust position than carrying out described control of dust, and the analysis of this furnace roof CO analyser is in described exhaust path and more leaning on the CO concentration in the described waste gas of upstream end than the control of dust position of carrying out described control of dust; And
Oxygen analyzer under stove, to irradiating laser in more leaning on the described waste gas of downstream flow than described control of dust position, changes according to the light quantity being caused by photoabsorption of this laser, analyzes oxygen concn.
2. converter waste gas retrieving arrangement as claimed in claim 1, is characterized in that,
Under described stove, oxygen analyzer possesses:
Laser irradiating part, irradiates described laser in the rectangular mode of medullary ray of the stream with respect to described waste gas;
Laser light-receiving part, is subject to light to pass through the described laser after described waste gas;
The first tubular stinger, outstanding to surround the mode of surrounding of light path of described laser in described exhaust path from described laser irradiating part, and front opening;
The second tubular stinger, outstanding to surround the mode of surrounding of light path of described laser in described exhaust path from described laser light-receiving part, and front opening; And
Nitrogen is supplied with respectively in nitrogen gas supply unit in described the first tubular stinger and in described the second tubular stinger.
3. converter waste gas retrieving arrangement as claimed in claim 2, is characterized in that,
The described laser light-receiving part of take is subject to the transmissivity of the described laser that the light quantity of the described laser of the wavelength beyond the oxygen absorption wavelength of light represents with respect to the ratio of the light quantity of the described laser irradiating from described laser irradiating part as more than 10%.
4. converter waste gas retrieving arrangement as claimed in claim 3, is characterized in that,
The interval of the front end of the front end of described the first tubular stinger and described the second tubular stinger and the relation of described transmissivity meet following formula 1,
X=α * exp(-L * β * v) * 100 formula 1
Herein, X is described transmissivity, and unit is %, and L is described interval, and unit is m, the flow velocity that v is described waste gas, and unit is m/s, the reduction coefficient that α is described laser, β is for representing the coefficient of the absorbancy of described waste gas.
5. the converter waste gas retrieving arrangement as described in any one in claim 2～4, is characterized in that,
In the situation that observe with the vertical sight line of the virtual plane of the medullary ray of the stream with respect to comprising described waste gas and the optical axis of described laser, in the flow direction downstream side of the front end of described the first tubular stinger and these both sides' of front end of described the second tubular stinger described waste gas, be formed with respectively otch.
6. converter waste gas retrieving arrangement as claimed in claim 5, is characterized in that,
In the situation that observing described otch with described sight line,
Described otch is formed by the scarp of medullary ray above 75 ° of following inclinations at 45 ° of the stream with respect to described waste gas, and,
More than 1/3 below 2/3 of the physical dimension that the length dimension of the direction of the medullary ray of the stream along described waste gas on this scarp is described tubular stinger.
7. a converter waste gas recovery method, right to use requires the converter waste gas retrieving arrangement described in any one in 1～4 to carry out, and this converter waste gas recovery method is characterised in that,
When starting to bessemerize, the described waste gas producing being carried out to atmosphere diffuses;
At the described oxygen concn being analyzed by described furnace roof oxygen analyzer with the described oxygen concn that under by described stove, oxygen analyzer analyzes is below normality and the described CO concentration being analyzed by described furnace roof CO analyser is normality when above, reclaim described waste gas.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2012/064006 WO2013179432A1 (en) | 2012-05-30 | 2012-05-30 | Exhaust gas recovery device for converter furnace and method for recovering exhaust gas for converter furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103582705A true CN103582705A (en) | 2014-02-12 |
| CN103582705B CN103582705B (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201280007019.8A Active CN103582705B (en) | 2012-05-30 | 2012-05-30 | Exhaust gas recovery device for converter furnace and method for recovering exhaust gas for converter furnace |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2695952B1 (en) |
| KR (1) | KR101476572B1 (en) |
| CN (1) | CN103582705B (en) |
| BR (1) | BR112013019355B1 (en) |
| CA (1) | CA2821824C (en) |
| WO (1) | WO2013179432A1 (en) |
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| CN106662528A (en) * | 2015-09-02 | 2017-05-10 | 富士电机株式会社 | Analysis device and exhaust gas treatment device |
| CN110749557A (en) * | 2018-07-24 | 2020-02-04 | 北京琪玥环保科技股份有限公司 | Useless processing system of danger with laser oxygen analysis appearance |
| CN113791128A (en) * | 2021-11-16 | 2021-12-14 | 南京尚中过滤与分析设备有限公司 | Safety alarm system and method for gas concentration in converter gas |
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| JP6451438B2 (en) * | 2015-03-24 | 2019-01-16 | 新日鐵住金株式会社 | Laser analyzer |
| CN108799833A (en) * | 2018-07-27 | 2018-11-13 | 山东煜龙环保科技股份有限公司 | A kind of nitrogen recycling circulatory system |
| JP6992794B2 (en) * | 2019-02-04 | 2022-01-13 | Ｊｆｅスチール株式会社 | Saturator and converter exhaust gas treatment equipment |
| KR102213975B1 (en) * | 2019-08-23 | 2021-02-08 | 현대제철 주식회사 | Apparatus for recoverying linz donawitz gas and method of recoverying linz donawitz gas using the same |
| CN114262764A (en) * | 2021-12-31 | 2022-04-01 | 北京清创晋华科技有限公司 | Converter gas full recovery device |
| CN116004940A (en) * | 2023-01-07 | 2023-04-25 | 首钢京唐钢铁联合有限责任公司 | Converter flue gas recovery method and system |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2695952A1 (en) | 2014-02-12 |
| KR101476572B1 (en) | 2014-12-24 |
| BR112013019355A2 (en) | 2017-02-21 |
| CA2821824A1 (en) | 2013-11-30 |
| BR112013019355B1 (en) | 2019-04-09 |
| KR20140023271A (en) | 2014-02-26 |
| CA2821824C (en) | 2016-04-05 |
| WO2013179432A1 (en) | 2013-12-05 |
| EP2695952B1 (en) | 2018-01-24 |
| CN103582705B (en) | 2015-03-25 |
| EP2695952A4 (en) | 2015-11-11 |
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Address after: Tokyo, Japan Patentee after: Nippon Iron & Steel Corporation Address before: Tokyo, Japan Patentee before: Nippon Steel Corporation |